Marshfield-02B

Marshfield, Green Harbor

42.089292, -70.644468

Dimensions: 4ft diameter, 3ft height
Condition: Good
Comments: Both culverts appeared to be in good condition. The upstream wingwall was in good condition, but appeared to be starting to slightly separate from the headwall.

Comprehensive field assessment conducted in 2024

Upstream Invasive Species: Yes
Downstream Invasive Species: Yes
Invasive Species Notes: Phragmites along fringe, becomes dense and surrounding channel approximate 570 feet upstream of tide gate.
Additional Comments (2024): Tide gate submerged due to incoming tide, not all factors could be assessed, however severe die off, lack of low marsh community, constriction of sediment exchange and encroaching phragmites indicate tidal restriction.

Legacy data from previous surveys and documentation

Invasive Species: Yes
Restoration Status: In-Progress
Invasive Comments: Upstream impoundment was mostly comprised of high marsh with some low marsh and fringing phragmites.
Restoration Comments: Due to be replaced with self-regulating tidegate (FEMA Project IMPACT).

General Comments: Site is located directly off of Town pier Road and easily accessible. Note that Jason Burtner can provide permitting drawings and other relevant files and site information to further flesh out attributes. Permitted together with Marshfield 01
Operation Plan: Yes
Gate Comments: There were two tide gates installed at this location. A metal self-regulating tide (SRT) gate was installed to the west (Marshfield-02A) and a metal flap gate was installed to the east (Marshfield-02B). The self-regulating tide gate was in good condition and was operable (all of its floats were intact). The SRT was installed at a 45 degree angle to enable it to directly face the channel. A hand operated winch and strap had been installed to operate the SRT and the strap was weathered. The metal flap gate appeared to be in good condition and operable.

Elevation Comments: See "General Comments". Invert elevation and extent of downstream tidal influence can be located on permitted plans to be uploaded. Staining was not apparent on the upstream headwall (i.e., it was higher), so extent of upstream tidal influence could not be assessed.
Other Comments: Many killifish were observed on the downstream side of the tide gate.
External Data Comments: US ACOE NAE-2004-3126 Green Harbor Tide Gates Permit Application 10.2.2002 US ACOE NAE-2004-3126 Green Harbor Tide Gates Permit 12.3.2004 US ACOE NAE-2004-3126 Green Harbor Tide Gates Operation and Maintenance Plan 12.3.2004